# Electron Transport in Disordered Graphene Nanoribbons

## TL;DR

This study investigates electron transport in disordered graphene nanoribbons, revealing a width-dependent transport gap, localization effects, and the influence of charging effects on activation energy across different temperatures.

## Contribution

It provides new insights into the transport gap formation and charge localization in graphene nanoribbons, highlighting the role of geometric capacitance and charging effects.

## Key findings

- Transport gap inversely proportional to width
- Transition from thermally activated to variable range hopping
- Charging effects significantly contribute to activation energy

## Abstract

We report an electron transport study of lithographically fabricated graphene nanoribbons of various widths and lengths at different temperatures. At the charge neutrality point, a length-independent transport gap forms whose size is inversely proportional to the width. In this gap, electron is localized, and charge transport exhibits a transition between simple thermally activated behavior at higher temperatures and a variable range hopping at lower temperatures. By varying the geometric capacitance through the addition of top gates, we find that charging effects constitute a significant portion of the activation energy.